Sorry about the problems you're having...
The easiest and best way to control velvet/ick is with a properly sized UV sterilizer with proper flow rate and a good bulb.
The next best method is copper sulfate, which you can still buy on Amazon.ca, in a QT. You'd need a very accurate scale and a way of testing the copper levels. Copper needs to always be above 0.16mg/l but not above 0.26mg/l. It's also best to add some citric acid to the mix to help it stay in solution better. Sorry I don't remember the recipe anymore... it was a long time ago I used to use it.
I'd never try treating fish with h2o2 as it will burn they're gills.
Cheers,
Tim
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